One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10)(11,17)(12,20)(13,18)(14,15)(16,21)(19,23)(22,24)(26,28)(27,33)(32,36)(34,39) involution — undirected(2,6)(3,8)(10,15)(12,21)(13,17)(19,22)(25,26,30,28)(27,31,33,35)(29,36,37,32)(34,40,39,38)(1,3)(2,4)(5,8)(6,7)(10,15)(11,18)(16,20)(19,22)(27,33)(31,35)(34,39)(38,40) involution — undirected(1,4)(2,3)(5,7)(6,8)(9,11)(10,13)(12,22)(14,18)(15,17)(16,24)(19,21)(20,23)(25,27)(26,31)(28,35)(29,34)(30,33)(32,38)(36,40)(37,39) involution — undirected(1,2)(3,4)(5,6)(7,8)(9,12)(10,16)(11,19)(13,23)(14,21)(15,20)(17,24)(18,22)(25,28,30,26)(27,31,33,35)(29,36,37,32)(34,38,39,40)(1,4)(2,3)(5,7)(6,8)(9,13)(10,11)(12,23)(14,17)(15,18)(16,19)(20,22)(21,24)(25,29)(26,32)(27,34)(28,36)(30,37)(31,38)(33,39)(35,40) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.